Mollusca is a Phylum/Division in which animals are soft body with a thick skin called Mantle. They also have Antennae and muscular foot underside their body.
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Answer:
The correct answer is A. Foot for movement.
Explanation:
Mollusks have some principal characteristics that make them different. A structure that is known as the mantle that covers the visceral mass of the animal, the radula that is useful for eating, their nervous system, among others.
The foot for movement is one of these characteristics. It is a very important structure, composed of many potent and complex muscle mass with many equilibrium sensors. Its most extended use is for locomotion. This foot can secrete a mucus that is useful for movement. It also sticks the animal to the surface.
